Flocq-based parsing of floating-point literals (Jacques-Henri Jourdan)

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2065 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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 Release 1.12
 ========================
 
+Improvements in confidence:
+- Floating-point literals are now parsed and converted to IEEE-754 binary
+  FP numbers using a provably-correct conversion function implemented on
+  top of the Flocq library.
+
 Language semantics:
 - The "&&" and "||" operators are now primitive in CompCert C and are
   given explicit semantic rules, instead of being expressed in terms